Stool thin strip may be due to hemorrhoids, intestinal polyps, intestinal tumors and the symptoms caused. 1. Hemorrhoids: hemorrhoids are mostly caused by varicose veins in the hemorrhoidal plexus, which can cause diarrhea and constipation alternating with anal itching, anal pain and blood in the stool, and such people can experience symptoms such as thin stripes in the stool and pain in defecation. 2. Intestinal polyps: this kind of lesions of people can have the symptoms of constipation or diarrhea alternately, and sometimes can have the symptoms of difficult defecation and thin stripes in defecation and so on. 3. Intestinal tumors: Tumors usually protrude into the intestinal lumen, and when the tumor grows to a certain extent, it can block the discharge of feces, so the feces can appear thin stripes and other phenomena. It is recommended that people who have thin strips of feces should go to the hospital for consultation in time.